a temporary traffic arrangement, usually on a main road, in which traffic travelling in both directions uses one side of the road while the other side is being repaired(由于公路另一侧修缮而暂时实行的)一侧双向行驶
A contraflow is in operation/in force between junctions 13 and 14 on the motorway.这条高速公路第13和第14个交叉口之间正实行一侧双向行驶。